Next generation gaming

The last session I attended during Imagina 2005 focused on the impact of the next generation game consoles (Xbox 2 and Playstation 3) on game development. The panel was discussing the potential for ever more realistic games enabled by ever more powerful CPU's. But this discussion made me wonder why these game developers are not taking better advantage of most powerful CPU available, the human brain. There should be more games that 'facilitate' imagination. More realism in games means less imagination in my opinion, which is a waste of resources....